Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd1bb3506f29962…

MALICIOUS

PDF

69.5 KB Created: 2021-05-02 04:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 833ebabd31f1bdca21acc20fcb2e873b SHA-1: 718235fd921476ee625113ea168934b4ca5d502f SHA-256: 4fd1bb3506f29962c62139e0c966388a636fbdfdbd2c88bb368ad1ce896a1b4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links pointing to compromised WordPress sites, likely intended to host and distribute further malicious content. The presence of these links suggests an attempt to trick users into downloading a malicious second-stage payload disguised as a tutorial PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6d19a7eb9666de5e03acaf3c486d272e/fabanogepen.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10d1c19a4---9808384756.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcfd8a559---juvapami.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160839bf14da2c---50335228498.pdf
    • https://actor-conseil.com/files/file/kopafaxari.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce5b15749---81461226202.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608172f21bc65---21673568189.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/k0m75q93kjh55ds9pg7s87lph7/nitevefuvetinu.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9ca721ba13c4ce519b163c76b9d9dc19/lexivakaritugopajiwibozel.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a17984b5---89267578107.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e4fc6bb8---dadaxa.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rvpvn7rol7krucvn8sqnk351h7/lelawetufonifigeridatafed.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0027b90822f73f5f2396b8ccaa4dd875/89107521440.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d12421f7c---66000728368.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=autosys+job+scheduling+tool+tutorial+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d272.bin
30a19aea2dd50a845635c1000f211d77ec67f335f645e3b0e8ec729851da3dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 5724 bytes
font_01_sfnt_off0000e5f1.bin
08a9a997189f00cf7f13380c44abbb10634f9a4f33298fe5276cc49e3e21c5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10400 bytes

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